diff --git a/src/expert-insurer/helper/timeline-fa-labels.spec.ts b/src/expert-insurer/helper/timeline-fa-labels.spec.ts
index 557d2fa..86895f9 100644
--- a/src/expert-insurer/helper/timeline-fa-labels.spec.ts
+++ b/src/expert-insurer/helper/timeline-fa-labels.spec.ts
@@ -43,18 +43,18 @@ describe("insurer timeline Persian labels", () => {
     );
   });
 
-  it("localizes human-readable assignment metadata", () => {
+  it("preserves human-readable assignment metadata exactly", () => {
     expect(
       localizeTimelineMetadata({
         type: "CLAIM_ASSIGNED",
         metadata: { note: "Expert assigned via review assign endpoint" },
       }),
     ).toEqual({
-      note: "پرونده از طریق فرایند بررسی به کارشناس تخصیص داده شد.",
+      note: "Expert assigned via review assign endpoint",
     });
   });
 
-  it("localizes Fanavaran errors while retaining machine-facing metadata", () => {
+  it("preserves Fanavaran metadata keys and values exactly", () => {
     expect(
       localizeTimelineMetadata({
         type: "FANAVARAN_EXPERTISE_AUTO_SUBMIT_FAILED",
@@ -65,12 +65,11 @@ describe("insurer timeline Persian labels", () => {
       }),
     ).toEqual({
       clientKey: "parsian",
-      clientFaLabel: "پارسیان",
-      error: "اطلاعات کارشناسی برای ارسال به فناوران آماده نیست.",
+      error: "Fanavaran expertise payload is not ready.",
     });
   });
 
-  it("adds Persian labels for displayable metadata enums", () => {
+  it("does not add fields to existing metadata", () => {
     expect(
       localizeTimelineMetadata({
         type: "STEP_COMPLETED",
@@ -84,15 +83,10 @@ describe("insurer timeline Persian labels", () => {
       }),
     ).toEqual({
       role: "FIRST",
-      roleFaLabel: "طرف اول",
       stepKey: "USER_SUBMISSION_COMPLETE",
-      stepFaLabel: "ارسال اطلاعات توسط کاربر",
       carType: "sedan",
-      carTypeFaLabel: "سواری",
       captureType: "angle",
-      captureTypeFaLabel: "زاویه خودرو",
       captureKey: "front",
-      captureKeyFaLabel: "نمای جلو",
     });
   });
 });
diff --git a/src/expert-insurer/helper/timeline-fa-labels.ts b/src/expert-insurer/helper/timeline-fa-labels.ts
index 600da67..2bf59ae 100644
--- a/src/expert-insurer/helper/timeline-fa-labels.ts
+++ b/src/expert-insurer/helper/timeline-fa-labels.ts
@@ -187,79 +187,6 @@ export const STEP_KEY_FA_LABELS: Record<string, string> = {
   CLAIM_COMPLETED: "پرونده خسارت تکمیل شد",
 };
 
-const TIMELINE_STEP_FA_LABELS: Record<string, string> = {
-  ...STEP_KEY_FA_LABELS,
-  FIRST_VIDEO: "ویدیوی طرف اول",
-  SECOND_VIDEO: "ویدیوی طرف دوم",
-};
-
-const ROLE_FA_LABELS: Record<string, string> = {
-  FIRST: "طرف اول",
-  SECOND: "طرف دوم",
-  FIRST_PARTY: "طرف اول",
-  SECOND_PARTY: "طرف دوم",
-};
-
-const VEHICLE_TYPE_FA_LABELS: Record<string, string> = {
-  sedan: "سواری",
-  suv: "شاسی‌بلند",
-  hatchback: "هاچ‌بک",
-  pickup: "وانت",
-  van: "ون",
-};
-
-const CAPTURE_TYPE_FA_LABELS: Record<string, string> = {
-  angle: "زاویه خودرو",
-  part: "قطعه آسیب‌دیده",
-};
-
-const CAPTURE_KEY_FA_LABELS: Record<string, string> = {
-  front: "نمای جلو",
-  back: "نمای عقب",
-  left: "نمای چپ",
-  right: "نمای راست",
-  top: "نمای بالا",
-};
-
-const DOCUMENT_KEY_FA_LABELS: Record<string, string> = {
-  car_green_card: "کارت سبز خودرو",
-  car_certificate: "سند خودرو",
-  national_card: "کارت ملی",
-  damaged_driving_license_front: "روی گواهینامه طرف آسیب‌دیده",
-  damaged_driving_license_back: "پشت گواهینامه طرف آسیب‌دیده",
-  damaged_chassis_number: "شماره شاسی خودروی آسیب‌دیده",
-  damaged_engine_photo: "تصویر موتور خودروی آسیب‌دیده",
-  damaged_car_card_front: "روی کارت خودروی آسیب‌دیده",
-  damaged_car_card_back: "پشت کارت خودروی آسیب‌دیده",
-  damaged_metal_plate: "پلاک خودروی آسیب‌دیده",
-  guilty_driving_license_front: "روی گواهینامه طرف مقصر",
-  guilty_driving_license_back: "پشت گواهینامه طرف مقصر",
-  guilty_car_card_front: "روی کارت خودروی مقصر",
-  guilty_car_card_back: "پشت کارت خودروی مقصر",
-  guilty_metal_plate: "پلاک خودروی مقصر",
-  guilty_damage_area: "ناحیه آسیب‌دیده خودروی مقصر",
-};
-
-const CLIENT_FA_LABELS: Record<string, string> = {
-  parsian: "پارسیان",
-};
-
-const REPLY_FIELD_FA_LABELS: Record<string, string> = {
-  damageExpertReply: "پاسخ کارشناس خسارت",
-  damageExpertReplyFinal: "پاسخ نهایی کارشناس خسارت",
-};
-
-const TIMELINE_SYSTEM_TEXT_FA: Record<string, string> = {
-  "Expert assigned via review assign endpoint":
-    "پرونده از طریق فرایند بررسی به کارشناس تخصیص داده شد.",
-  "Expert assigned for factor validation review":
-    "پرونده برای بررسی و تأیید فاکتورها به کارشناس تخصیص داده شد.",
-  "Field expert portfolio lock (no status change)":
-    "پرونده برای بررسی در اختیار کارشناس میدانی قرار گرفت.",
-  "Fanavaran expertise payload is not ready.":
-    "اطلاعات کارشناسی برای ارسال به فناوران آماده نیست.",
-};
-
 const GENERIC_EVENT_FA_LABEL = "رویداد پرونده";
 const GENERIC_EVENT_FA_DESCRIPTION = "رویدادی در روند پرونده ثبت شد.";
 
@@ -339,35 +266,9 @@ export function getEventFaDescription(event: {
   return label ? `${label}.` : GENERIC_EVENT_FA_DESCRIPTION;
 }
 
-function containsLatinText(value: string): boolean {
-  return /[A-Za-z]/.test(value);
-}
-
-function localizeHumanReadableMetadataText(
-  value: unknown,
-  event: { type: string; metadata?: Record<string, unknown> },
-  field: "note" | "error" | "message" | "warning",
-): unknown {
-  if (typeof value !== "string" || !containsLatinText(value)) return value;
-
-  const knownTranslation = TIMELINE_SYSTEM_TEXT_FA[value.trim()];
-  if (knownTranslation) return knownTranslation;
-
-  if (field === "error" || field === "warning") {
-    return event.type.endsWith("_FAILED")
-      ? getEventFaDescription(event)
-      : "در اجرای این عملیات خطایی رخ داد.";
-  }
-
-  return field === "note"
-    ? "یادداشت سیستمی این رویداد ثبت شد."
-    : getEventFaDescription(event);
-}
-
 /**
- * Builds presentation-safe timeline metadata. Raw identifiers and enum values
- * remain available for integrations; Persian companion labels are added for
- * UI rendering, while persisted human-readable English text is replaced.
+ * Keeps the established metadata contract intact. Only a pre-existing
+ * description field is localized; no keys are added, removed, or renamed.
  */
 export function localizeTimelineMetadata(event: {
   type: string;
@@ -375,83 +276,10 @@ export function localizeTimelineMetadata(event: {
 }): Record<string, unknown> | null {
   if (!event.metadata) return null;
 
-  const metadata: Record<string, unknown> = { ...event.metadata };
-
-  if (Object.prototype.hasOwnProperty.call(metadata, "description")) {
-    metadata.description = getEventFaDescription(event);
-  }
-
-  for (const field of ["note", "error", "message", "warning"] as const) {
-    if (Object.prototype.hasOwnProperty.call(metadata, field)) {
-      metadata[field] = localizeHumanReadableMetadataText(
-        metadata[field],
-        event,
-        field,
-      );
-    }
-  }
-
-  if (Array.isArray(metadata.warnings)) {
-    metadata.warnings = metadata.warnings.map((warning) =>
-      localizeHumanReadableMetadataText(warning, event, "warning"),
-    );
-  }
-
-  const role = typeof metadata.role === "string" ? metadata.role : undefined;
-  if (role && ROLE_FA_LABELS[role]) {
-    metadata.roleFaLabel = ROLE_FA_LABELS[role];
-  }
-
-  const stepKey =
-    typeof metadata.stepKey === "string" ? metadata.stepKey : undefined;
-  if (stepKey && TIMELINE_STEP_FA_LABELS[stepKey]) {
-    metadata.stepFaLabel = TIMELINE_STEP_FA_LABELS[stepKey];
-  }
-
-  const carType =
-    typeof metadata.carType === "string" ? metadata.carType : undefined;
-  if (carType && VEHICLE_TYPE_FA_LABELS[carType]) {
-    metadata.carTypeFaLabel = VEHICLE_TYPE_FA_LABELS[carType];
-  }
-
-  const captureType =
-    typeof metadata.captureType === "string" ? metadata.captureType : undefined;
-  if (captureType && CAPTURE_TYPE_FA_LABELS[captureType]) {
-    metadata.captureTypeFaLabel = CAPTURE_TYPE_FA_LABELS[captureType];
-  }
-
-  const captureKey =
-    typeof metadata.captureKey === "string" ? metadata.captureKey : undefined;
-  if (captureKey && CAPTURE_KEY_FA_LABELS[captureKey]) {
-    metadata.captureKeyFaLabel = CAPTURE_KEY_FA_LABELS[captureKey];
-  }
-
-  const resolvedCarAngleKey =
-    typeof metadata.resolvedCarAngleKey === "string"
-      ? metadata.resolvedCarAngleKey
-      : undefined;
-  if (resolvedCarAngleKey && CAPTURE_KEY_FA_LABELS[resolvedCarAngleKey]) {
-    metadata.resolvedCarAngleFaLabel =
-      CAPTURE_KEY_FA_LABELS[resolvedCarAngleKey];
-  }
-
-  const documentKey =
-    typeof metadata.documentKey === "string" ? metadata.documentKey : undefined;
-  if (documentKey && DOCUMENT_KEY_FA_LABELS[documentKey]) {
-    metadata.documentFaLabel = DOCUMENT_KEY_FA_LABELS[documentKey];
-  }
-
-  const clientKey =
-    typeof metadata.clientKey === "string" ? metadata.clientKey : undefined;
-  if (clientKey && CLIENT_FA_LABELS[clientKey]) {
-    metadata.clientFaLabel = CLIENT_FA_LABELS[clientKey];
-  }
-
-  const replyField =
-    typeof metadata.replyField === "string" ? metadata.replyField : undefined;
-  if (replyField && REPLY_FIELD_FA_LABELS[replyField]) {
-    metadata.replyFieldFaLabel = REPLY_FIELD_FA_LABELS[replyField];
-  }
-
-  return metadata;
+  return {
+    ...event.metadata,
+    ...(Object.prototype.hasOwnProperty.call(event.metadata, "description")
+      ? { description: getEventFaDescription(event) }
+      : {}),
+  };
 }